Conditional compilation

Hi guys,
I need some conditional compilation.
Normally I use the @ifdef, @ifndef ... @endif statements to enable or disable some code and it works.
But if I need to switch some Variabile declaration like:

Code:

---

@ ifdef Devboard
  EnterKey  VAR Key.0
  StopKey  VAR Key.1
  StartKey  VAR Key.2
@ else
  EnterKey  VAR Key.2
  StopKey  VAR Key.0
  StartKey  VAR Key.1
@ endif

---

I obtain the error message: variable already an alias
for each duplicate variable declaration line.

There is another way to obtain the conditional change of assignment?
Thk you
Roberto

The @ ifdef statements only work during assembly, but that's AFTER the PBP program has been compiled.
So it can't directly affect PBP variables.

However, in ASM you can undefine bit variables and re-define them, which has pretty much the same effect.

Code:

---

Key      VAR PORTB
EnterKey  VAR BIT EXT :@ #undefine EnterKey
StopKey  VAR BIT EXT :@ #undefine StopKey
StartKey  VAR BIT EXT :@ #undefine StartKey
ASM
  ifdef Devboard
    #define EnterKey  _Key,0
    #define StopKey  _Key,1
    #define StartKey  _Key,2
  else
    #define EnterKey  _Key,2
    #define StopKey  _Key,0
    #define StartKey  _Key,1
  endif
ENDASM

---

Thanks Darrel, as always, your help is effective and wellcome.
Roberto